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Steelmaking converter smoke-gas washing water quality controlling method

A technology for steelmaking converter and water quality control, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to ensure normal production, save new water, and eliminate pollution sources.

Inactive Publication Date: 2008-07-30
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is for existing Na 2 CO 3 The application of the softening method in the control of the water quality of the converter flue gas washing water provides a water quality control method for the steelmaking converter flue gas washing water to achieve a good water quality softening effect of the steelmaking converter flue gas washing water

Method used

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Embodiment 1

[0029] According to the present invention, the water quality of the converter flue gas washing water of a certain steel plant is detected, the P alkali value in the converter flue gas washing water water is 8.20mmol / L, the M alkali value is 24.80mmol / L, and the total hardness is 0.36mmol / L L, the calcium ion concentration is 6.41mg / L. After adding NaOH to the converter flue gas washing water, the P alkali value in the converter flue gas washing water is 16.80mmol / L, and the M alkali value is 30.40mmol / L, reaching 2P>M and P≠M. At this time, the converter flue gas The total hardness of the gas washing water is 0.20mmol / L, and the calcium ion concentration is 3.21mg / L, meeting the softening requirements of the converter flue gas washing water of this steel plant.

Embodiment 2

[0031] According to the present invention, the water quality of the converter flue gas washing water of a certain steel plant is detected, the P alkali in the converter flue gas washing water water is 8.00mmol / L, the M alkali is 20.80mmol / L, and the total hardness is 0.34mmol / L, The calcium ion concentration was 6.41mg / L. After adding NaOH to the converter flue gas washing water, the P alkali value in the converter flue gas washing water is 17.60mmol / L, and the M alkali value is 31.10mmol / L, reaching 2P>M and P≠M. At this time, the converter flue gas The total hardness of the gas washing water is 0.14mmol / L, and the calcium ion concentration is 4.01mg / L, meeting the softening requirements of the converter flue gas washing water of this steel plant.

Embodiment 3

[0033]According to the converter flue gas washing water quality control method, the water quality of the converter flue gas washing water in a steel plant was tested. The P alkali value in the converter flue gas washing water water was 0, the M alkali value was 7.10mmol / L, and the total hardness was 0.42mmol / L, calcium ion concentration is 7.10mg / L. After adding NaOH to the converter flue gas washing water, the P base value in the converter flue gas washing water is 9.70mmol / L, the M base value is 15.20mmol / L, reaching 2P>M and P≠M, the converter flue gas washing water The total hardness is 0.08mmol / L, and the calcium ion concentration is 1.60mg / L, meeting the softening requirements of the converter flue gas washing water of this steel plant.

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Abstract

The invention relates to a method for regulating the quality of washing water for flue gas in a steel-making converter, which is an optimized regulation proposal of softening method of sodium carbonate by analyzing and determining the relationship between regulation of water alkalinity and hardness. The method for regulating the quality of washing water for flue gas in the converter comprises the following steps: when two times of a P alkalinity value is smaller than / equal to a M alkalinity value, NaOH is added into the washing water for flue gas in the converter, until two times of the P alkalinity value is larger than the M alkalinity value, which means 2P is larger than M and P is not equal to M; when P is equal to M, the sodium carbonate is added into the water, wherein, the P alkalinity value is the alkalinity measured by applying phenolphthalein as indicator and is phenolphthalein alkalinity, and the M alkalinity value is the alkalinity measured by applying methyl orange as indicator and is the total alkalinity. The system of washing water for flue gas in the converter adopts a manner of total recycle. The method can cause the quality of the washing water for flue gas in the converter to reach good softening effect and can solve the problem of scaling in the system of washing water for flue gas in the converter, which adopts total recycle with zero discharge to reduce pollution.

Description

technical field [0001] The invention relates to the field of water treatment of flue gas washing water of a steelmaking converter in the metallurgical industry. Background technique [0002] Sodium carbonate softening method is a commonly used method to treat steelmaking converter flue gas washing water, but it encounters problems in practical application. In many cases, a large amount of sodium carbonate agent is added to the system and the softening effect is still not achieved, resulting in the problem of scaling in the water system. The reason is that there is a large amount of HCO in the converter flue gas washing water 3 - , HCO 3 - with Ca in water 2+ , Mg 2+ Generate Ca(HCO 3 ) 2 , Mg(HCO 3 ) 2 , while Ca(HCO 3 ) 2 , Mg(HCO 3 ) 2 Soluble in water, it is difficult to form precipitates and remove them in the sedimentation tank. Once it passes through the water treatment process, such as precipitation, cooling, CO in water 2 The escape, part of the HCO 3...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 习明安李英王伟
Owner WUHAN IRON & STEEL (GROUP) CORP
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